CN212534259U - External-in and internal-out type drum net bottom online dredging system - Google Patents

Abstract

The utility model discloses an advance interior online desilting system of type drum net bottom outward, this online desilting system include drum net room, be provided with the cydariform filter screen in the drum net room, one side of drum net room is along the desilting passageway that transversely sets up a plurality of interval arrangements, desilting passageway vertical arrangement, the opening and the ground parallel and level of desilting passageway, the sediment pit that transversely is provided with a plurality of interval arrangements is followed to the back of the body side runner of drum net room bottom, a plurality of sediment pits are linked together with the bottom of a plurality of desilting passageways respectively, but the top hoist and mount of a plurality of desilting passageways have lateral shifting's desilting device, through the desilting device is transferred to the sediment pit through the desilting passageway, pumps the clearance to the sediment. The utility model discloses can realize carrying out the clearance of bottom siltation rubbish under the normal operating condition that the cydariform filter screen does not shut down, the manpower and materials cost of the desilting operation in the past that has significantly reduced has promoted the security of desilting operation.

Description

External-in and internal-out type drum net bottom online dredging system

Technical Field

The utility model belongs to the technical field of nuclear power plant's circulating water filters blowdown, concretely relates to go into online desilting system in interior play drum net bottom outward.

Background

The drum-shaped filter screen is used as the last-stage large-scale filter equipment for defending marine organisms in a depth defense system of a nuclear power plant cold source security system, and the performance of the drum-shaped filter screen directly determines the safety of the nuclear power plant cold source. Through comparative analysis and experience feedback on the capability of resisting marine organism invasion of two types of drum type filter screens of 'outside-in-inside-out' and 'inside-in-outside-out' in a nuclear power plant, the drum type filter screen has obvious advantages in the aspect of marine organism prevention and control.

In a circulating water system of an external-in and internal-out drum-shaped filter screen, garbage with high specific gravity in water flow is deposited on a flow channel at the bottom of a drum screen and cannot be taken away by a drum screen dredging plate, and the garbage is deposited on the flow channel at the bottom of the drum screen, so that the normal operation of the drum screen is influenced by excessive deposition. Usually, the amount of marine organisms deposited in the bottom flow channel of the drum net is about 15 tons in a maintenance cycle, the deposits are mainly of marine organisms such as green-lipped mussels and barnacles, the deposition position is mainly on the flow channel on the back water side under the drum net, and the deposition range is about 4 x 1.5 meters. Due to the key position of the drum-shaped filter screen in the cold source system, in order to ensure the normal operation of the drum-shaped filter screen, a professional needs to enter the bottom of the drum-shaped screen chamber to carry out periodical dredging when the drum-shaped filter screen is in a shutdown state, so that the normal operation of the drum-shaped filter screen is influenced, the cost of manpower and material resources for dredging is increased, and the dredging operation is dangerous. In view of the above, the online dredging system for the bottom of the outward-entering and inward-exiting drum-shaped filter screen is provided, so that on one hand, the normal operation of the drum screen is not influenced, on the other hand, deposited garbage can be timely cleaned, the operation burden of the drum screen is reduced, the manpower and material resources cost of dredging operation is reduced, and the safety of the dredging operation is very necessary.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an outer online desilting system in type drum net bottom that advances in to the outer type drum filter screen bottom rubbish siltation that advances that proposes in solving above-mentioned background art, can not get in time the clearance and lead to the problem that drum net operation burden increases even shut down.

In order to achieve the above object, the utility model provides a following technical scheme: the utility model provides an advance outer online desilting system in type drum net bottom, includes drum net room, be provided with the cydariform filter screen in the drum net room, the front side intercommunication of drum net room has into water flow channel, the rear side intercommunication of drum net room has out water flow channel, one side of drum net room is along transversely setting up a plurality of interval arrangement's desilting passageway, desilting passageway vertical arrangement, the opening and the ground parallel and level of desilting passageway, the stagnant pit that is provided with a plurality of interval arrangement is followed to the back of the body water side runner of drum net room bottom, a plurality of siltation pits are linked together with the bottom of a plurality of desilting passageways respectively, but the top hoist and mount of a plurality of desilting passageways have lateral shifting's desilting device, through the desilting device is transferred to the siltation pit through the desilting passageway, pumps the clearance to the silt.

Furthermore, the dredging device comprises a holding frame, a dredging assembly is arranged in the holding frame, the dredging assembly comprises a suction mechanism, a water flow speed reducing mechanism, a graded filtering mechanism, a garbage collector and an unloading mechanism which are sequentially connected, the suction mechanism and the graded filtering mechanism are arranged at the left and right sides, the water flow speed reducing mechanism is arranged between the suction mechanism and the graded filtering mechanism, the garbage collector and the unloading mechanism are sequentially arranged below the graded filtering mechanism,

the suction mechanism is used for sucking the sludge and comprises a suction center, a suction pipeline and a suction head assembly which are sequentially connected from top to bottom;

the water flow speed reducing mechanism is used for carrying out speed reduction treatment on water flow flowing through the water flow speed reducing mechanism;

the graded filtering mechanism is used for carrying out graded filtering on the sludge carried in the water flow flowing through the graded filtering mechanism, and comprises a mesh cage, and a plurality of filtering mesh chambers are arranged in the mesh cage;

the garbage collector is used for collecting the sludge accumulated in the grading filtering mechanism;

the discharging mechanism is used for discharging the collected sludge.

Furthermore, the siltation pit is of a quadrangular structure with the caliber gradually reduced from top to bottom.

Further, the inclination angle of the inner wall of the sludge pit is set to be 40-60 degrees.

Furthermore, a sludge pit detection switch is arranged at the top of the sludge pit.

Furthermore, a contact switch is arranged at the position of the pithead of the sedimentation pit.

Furthermore, a transport trolley is arranged at the opening of the dredging channel.

Furthermore, an automatic walking device for hoisting the dredging device is arranged above the plurality of dredging channels.

Compared with the prior art, the utility model provides an advance interior online desilting system of type drum net bottom outward possesses following beneficial effect:

1. the utility model discloses in the outer side of the interior profile modeling drum net room of advancing setting desilting passageway, drum net room bottom is provided with the siltation pit that communicates with desilting passageway bottom, utilize the desilting device to get into the siltation pit of drum net room bottom through the desilting passageway and carry out the online clearance of siltation, the desilting overall process does not influence the normal operating of cydariform filter screen, realize carrying out the clearance of bottom siltation rubbish under the normal operating condition that the cydariform filter screen does not shut down, the manpower and materials cost of the desilting operation in the past has greatly reduced, the security of desilting operation has been promoted;

2. the utility model adds a dredging channel beside the net chamber of the net drum, the dredging channel has smaller size and reasonable arrangement, and the installation arrangement of the back washing sewage drainage channel and the net drum device is not influenced;

3. the sedimentation pit is arranged on the back water side flow channel at the bottom of the drum net, the sedimentation characteristic of the garbage is fully considered by the design of the inclination angle of the inner wall of the sedimentation pit, when the garbage is pushed into the sedimentation pit under the action of water flow, the garbage can automatically slide to the bottom of the sedimentation pit because the inclination angle of the inner wall of the sedimentation pit is greater than the accumulation angle of the garbage, and the dredging device is convenient to suck;

4. the utility model adopts the dredging device to apply the suction filtration principle, realizes the 'fishing out' of the garbage from the water, and reduces the load burden of the power system;

5. the dredging device adopted by the utility model has small structure, easy assembly and disassembly and convenient maintenance and adjustment;

6. the utility model discloses the desilting principle of using is simple ingenious, and desilting operation step maneuverability is good.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description, do not constitute a limitation of the invention, in which:

FIG. 1 is a schematic structural view of an external-in and internal-out type drum net bottom online dredging system provided by the present invention;

FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;

FIG. 3 is a cross-sectional view taken along line B-B of FIG. 2;

FIG. 4 is a schematic structural diagram of the dredging device in FIG. 1;

FIG. 5 is a side view of FIG. 4 with the suction mechanism removed;

FIG. 6 is a schematic diagram of the construction of the suction head assembly of FIG. 4;

FIG. 7 is a schematic structural view of an embodiment of the water flow retarding mechanism of FIG. 4;

FIG. 8 is a schematic structural view of a second embodiment of the water flow retarding mechanism of FIG. 4;

FIG. 9 is a schematic diagram of a third embodiment of the water flow retarding mechanism of FIG. 4;

FIG. 10 is a schematic structural view of the discharge mechanism of FIG. 4;

FIG. 11 is a schematic structural view of the support mechanism of FIG. 4;

fig. 12 is a schematic structural view of the cleaning mechanism in fig. 4.

In the figure:

a net-blowing chamber 1;

a drum strainer 2;

a water inlet channel 3;

a water outlet flow passage 4;

a dredging channel 5;

a deposition pit 6;

a dredging device 7; a mounting platform 701; a holding frame 702; a suction mechanism 703; suction centre 703.1; a suction line 703.2; a suction head assembly 703.3; a suction head 703.3.1; flange connection 703.3.2; a tapered block 703.3.3; bump rollers 703.3.4; a suction mechanism camera 703.3.5; a mount 703.4; a quick connector 703.5; a water flow decelerating mechanism 704; a first cylindrical section 704.1; a conical section 704.2; a second cylindrical section 704.3; a third cylindrical section 704.4; a prism segment 704.5; a rectangular section 704.6; a buffer plate 704.7; a graded filtering mechanism 705; a netpen 705.1; 705.2 of a filter screen plate; a filter screen chamber 705.3; a classification filter mechanism detection switch 705.4; a garbage collector 706; a discharge mechanism 707; a housing 707.1; a rotating shaft 707.2; a roll-over panel 707.3; an inlet port 707.4; a discharge port 707.5; a support mechanism 708; a first guide 708.1; a first telescoping support 708.2; support rollers 708.3; a first spring 708.4; a cleaning mechanism 709; a second guide base 709.1; a second telescoping support 709.2; a sweeping block 709.3; a second spring 709.4; a special spreader 710; an electric retention frame 711; a cable lifting mechanism 712; a cable drum 712.1; cable diverter wheels 712.2; a spool support 712.3; an electric control cabinet 713; a positioning pin 714;

a sludge pit detection switch 8;

a contact switch 9;

a security fence 10;

a control cabinet 11;

a transport trolley 12;

and an automatic traveling device 13.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1 to 12, the present invention provides a technical solution: an external-in-internal-out type online dredging system for the bottom of a drum net comprises a drum net chamber 1, wherein a drum-shaped filter screen 2 is arranged in the drum net chamber 1, a water inlet channel 3 is communicated with the front side of the drum net chamber 1, a water outlet channel 4 is communicated with the rear side of the drum net chamber 1, a plurality of dredging channels 5 which are arranged at intervals are transversely arranged on one side of the drum net chamber 1, the dredging channels 5 are vertically arranged, the opening of the dredging channels 5 is flush with the ground, a plurality of sedimentation pits 6 which are arranged at intervals are transversely arranged on the back water side channel of the bottom of the drum net chamber 1 (as shown in figure 1, the back water side channel of the bottom of the drum net chamber 1 is the front side of the bottom of the drum net chamber 1), the plurality of sedimentation pits 6 are respectively communicated with the bottoms of the plurality of dredging channels 5, a transversely movable dredging device 7 is arranged above the plurality of dredging channels 5, and the dredging device 7 is placed into the sedimentation pits 6 through the dredging channels 5, performing suction cleaning on the sludge;

the siltation pit 6 is of a quadrangular structure with the caliber gradually reduced from top to bottom;

the inclination angle of the inner wall of the sedimentation pit 6 is determined by a deposition test according to the specific type of the sludge, preferably, the inclination angle of the inner wall of the sedimentation pit 6 is set to be 40-60 degrees, which is beneficial to the sludge in the net-blowing chamber 1 to easily slide to the bottom of the sedimentation pit 6 and is convenient for the dredging device 7 to suck and clean;

a sludge pit detection switch 8 is arranged at the top of the sludge pit 6, the sludge pit detection switch 8 is used for detecting the amount of sludge in the sludge pit 6, and when the amount of sludge reaches a preset value, the sludge pit detection switch 8 sends a signal to start the dredging operation;

a contact switch 9 is arranged at the mouth of the sedimentation pit 6, when the dredging device 7 is lowered to the mouth of the sedimentation pit 6, the contact switch 9 sends a signal, and the system controls the dredging device 7 to stop lowering;

a safety fence 10 is arranged around the opening of the plurality of dredging channels 5, and the safety fence 10 is used for protecting the safety of workers;

a control cabinet 11 is arranged on one side of the safety fence 10, and the control cabinet 11 is used for sealing electrical equipment such as switch equipment, protective electrical equipment and measuring instruments, is convenient to overhaul and protects the electricity utilization safety of the equipment and personnel;

the other side of the safety fence 10 is provided with a transport trolley 12, and the transport trolley 12 is used for uniformly conveying the sludge discharged by the dredging device 7 to a centralized garbage disposal point;

and automatic traveling devices 13 which are transversely arranged are arranged above the plurality of dredging channels 5, and the automatic traveling devices 13 are used for adjusting the positions of the dredging devices 7.

The dredging device 7 comprises a holding frame 702, a dredging assembly is arranged in the holding frame 702, the dredging assembly comprises a suction mechanism 703, a water flow speed reducing mechanism 704, a graded filtering mechanism 705, a garbage collector 706 and a discharging mechanism 707 which are connected in sequence,

the suction mechanism 703 is used for sucking the sludge in the sludge pit 6;

the suction mechanism 703 is arranged at the left section of the holding frame 702, the suction mechanism 703 comprises a suction hub 703.1, a suction pipeline 703.2 and a suction head assembly 703.3 which are sequentially connected from top to bottom, the suction hub 703.1 is arranged inside the holding frame 702, the suction pipeline 703.2 and the suction head assembly 703.3 are arranged below the holding frame 702, the suction hub 703.1 is arranged on the bottom surface inside the holding frame 702 through a mounting seat 703.4, one end of the suction pipeline 703.2 is connected with the bottom end of the suction hub 703.1 through a quick connector 703.5, and the other end of the suction pipeline 703.2 is connected with the suction head assembly 703.3 through a flange;

the suction head assembly 703.3 comprises a suction head 703.3.1, the suction head 703.3.1 is a conical structure with a gradually increasing caliber from top to bottom, a flange connection part 703.3.2 is arranged at the top end of the suction head 703.3.1, a plurality of conical blocks 703.3.3 are uniformly arranged at the bottom end of the suction head 703.3.1 along the circumferential direction, and the plurality of conical blocks 703.3.3 are beneficial to the suction head 703.3.1 to penetrate into sludge and fully contact with the sludge to effectively suck the sludge;

the bottom of the pit 6 is of a size larger than the suction head 703.3.1 so that the suction head 703.3.1 is in sufficient contact with the sludge for effective suction;

the lower part of the outer wall of the suction head 703.3.1 is annularly provided with a plurality of anti-collision rollers 703.3.4 which are arranged at intervals, and the anti-collision rollers 703.3.4 are used for preventing the suction head 703.3.1 from colliding with and rubbing against the wall surface of the dredging channel 5 to be damaged in the lifting process;

the outer wall of the suction head 703.3.1 is provided with a suction mechanism camera 703.3.5, and the suction mechanism camera 703.3.5 is used for instantly transmitting a front-end picture of dredging operation, so that ground personnel can conveniently master the suction condition in time to judge whether next dredging operation is needed;

the suction center 703.1 is the power driving core of the dredging device 7, and can select a suction pump of a suitable type according to different water qualities, sludge types, sludge sizes and installation and arrangement requirements;

the quick connector 703.5 can adopt a structure of two-end opening and closing type, two-end opening type, one-way opening and closing type and the like, is used for quickly disassembling and assembling the suction pipeline 703.2 and the suction center 703.1, has the characteristics of simple assembling and disassembling action and time and labor saving, and can ensure that the lifting of the dredging device 7 is not limited by the height of a factory building and is convenient to maintain and adjust because the suction pipeline 703.2 is longer in size and the quick connector 703.5 is used;

the suction line 703.2 may be a rubber hose of 2-3m length.

The water flow speed reducing mechanism 704 is used for reducing the speed of the water flow flowing through the water flow speed reducing mechanism, so that the high-speed water flow is prevented from generating large impact on parts in the graded filtering mechanism 705, and the service life of the graded filtering mechanism is prolonged;

the water flow speed reducing mechanism 704 comprises a speed reducing pipe, the speed reducing pipe comprises a water inlet section, a transition section and a water outlet section which are sequentially connected along the water flow direction,

the speed reducing pipe can adopt the following three structures to achieve the purpose of speed reducing treatment of water flow flowing through the speed reducing pipe;

in the first embodiment, the speed reducing pipe comprises a first cylindrical section 704.1, a conical section 704.2 with gradually enlarged caliber and a second cylindrical section 704.3 which are sequentially connected in the water flow direction;

in the second embodiment, the speed reducing pipe comprises a third cylindrical section 704.4, a prismatic section 704.5 with gradually enlarged caliber and a rectangular section 704.6 which are connected in sequence along the water flow direction;

the third embodiment and the second embodiment are different in that: two symmetrically arranged buffer plates 704.7 are arranged in the rectangular section 704.6, and the two buffer plates 704.7 are arranged in a splayed shape.

The graded filtering mechanism 705 is used for graded filtering of sediments entrained in water flow flowing through the graded filtering mechanism 705, the graded filtering mechanism 705 is arranged at the right section of the holding frame 702, the graded filtering mechanism 705 comprises a net cage 705.1, the left wall surface of the net cage 705.1 is provided with an inlet, the bottom surface of the net cage 705.1 is provided with an outlet, a plurality of left and right parallel filtering net plates 705.2 are arranged in the net cage 705.1, the inner cavity of the net cage 705.1 is divided into a plurality of filtering net chambers 705.3 by the plurality of filtering net plates 705.2, and the filtering precision of the plurality of filtering net plates 705.2 is higher and higher from left to right;

preferably, a graded filtering mechanism detection switch 705.4 is arranged at the top of the filtering screen chamber 705.3 close to the inlet of the mesh cage 705.1 and used for detecting the sediment amount in the filtering screen chamber in real time;

the filter screen plates 705.2 can select screen plates with different mesh shapes, different mesh distribution modes and different mesh filter precisions according to the type and size of the sludge.

The garbage collector 706 is disposed below the staged filtering mechanism 705, and is used for collecting sludge accumulated in the staged filtering mechanism 705.

The discharging mechanism 707 is disposed below the garbage collector 706, and is configured to discharge the collected sludge, the discharging mechanism 707 includes a housing 707.1, a feeding port 707.4 is disposed at a top end of the housing 707.1, a discharging port 707.5 is disposed at a bottom end of the housing 707.1, a rotating shaft 707.2 is disposed in the housing 707.1, a power source is disposed at one end of the rotating shaft 707.2, a turning plate 707.3 is disposed on the rotating shaft 707.2, and the turning plate 707.3 can rotate up and down by 90 ° around the rotating shaft 707.2;

the gravity inductor is arranged on the overturning plate 707.3 and is used for detecting the weight of sludge removed in each dredging operation, and meanwhile, the sludge discharge signal can be rechecked according to the weight detection, so that the false action of the detection switch 705.4 of the grading filtering mechanism is prevented.

The holding frame 702 is formed by assembling, welding and assembling angle steels and is used for fixing and holding other components in the dredging assembly;

a plurality of supporting mechanisms 708 are annularly arranged on the upper part of the outer wall of the holding frame 702, the supporting mechanisms 708 can prevent the retaining frame 702 from colliding and rubbing with the inner wall surface of the dredging channel 5 to cause damage in the lifting process of the dredging device 7, the supporting mechanisms 708 comprise first guide seats 708.1 which are radially arranged along the holding frame 702, the outer ends of the first guide seats 708.1 are connected with the inner wall of the holding frame 702 through bolts, first telescopic brackets 708.2 are arranged in the first guide seats 708.1, first springs 708.4 are arranged between the inner ends of the first telescopic brackets 708.2 and the inner ends of the first guide seats 708.1, the outer ends of the first telescopic brackets 708.2 penetrate through the wall surface of the holding frame 702 and extend out, and supporting rollers 708.3 which are vertically arranged are arranged at the outer ends of the first telescopic brackets 708.2;

preferably, two rows of supporting mechanisms 708 are arranged around the upper portion of the outer wall of the holding frame 702, each row of supporting mechanisms 708 includes four supporting mechanisms 708, and the four supporting mechanisms 708 are respectively located at the front side, the left side, the rear side and the right side of the holding frame 702.

A plurality of cleaning mechanisms 709 are annularly arranged at the lower part of the outer wall of the holding frame 702, the plurality of supporting mechanisms 708 are respectively arranged corresponding to the plurality of cleaning mechanisms 709 up and down, the cleaning mechanisms 709 include second guide seats 709.1 arranged along the radial direction of the holding frame 702, the outer ends of the second guide seats 709.1 are connected with the inner wall of the holding frame 702 through bolts, second telescopic brackets 709.2 are arranged in the second guide seats 709.1, second springs 709.4 are arranged between the inner ends of the second telescopic brackets 709.2 and the inner ends of the second guide seats 709.1, the outer ends of the second telescopic brackets 709.2 penetrate through the wall surface of the holding frame 702 and extend out, and cleaning blocks 709.3 are arranged at the outer ends of the second telescopic brackets 709.2;

preferably, four cleaning mechanisms 709 are provided, and the four cleaning mechanisms 709 are respectively located at the front side, the left side, the rear side and the right side of the holding frame 702;

the cleaning block 709.3 is coincident with the movement track of the supporting roller 708.3 in the lifting process of the dredging device 7, when the device descends, the cleaning block 709.3 can scrape obstacles such as algae and plants growing on the inner wall surface of the dredging channel 5 for the supporting roller 708.3, and the supporting roller 708.3 is ensured to play the role;

a special lifting appliance 710 is arranged on the top surface of the retaining frame 702, and the special lifting appliance 710 has a self-balancing function, so that the problem of uneven stress on each lifting point in the lifting process is solved, the stability of the lifting process of the dredging device 7 is ensured, and the operation safety is improved;

the dredging device 7 further comprises a mounting platform 701, the mounting platform 701 is fixedly connected to the ground through bolts, a mounting place is provided for the dredging device 7 to be unloaded, and a necessary movable space is reserved below the mounting platform 701 for the transport trolley 12;

the bottom surface of the holding frame 702 is provided with a plurality of positioning pins 714, and the positioning pins 714 are used for positioning when the holding frame 702 is placed on the placing platform 701;

an electric retention frame 711 is arranged outside the holding frame 702, the electric retention frame 711 can enable an electric control system to still function when the dredging device 7 needs to be immersed into water for working, and is beneficial to the safe dredging operation of the dredging device 7, a cable lifting mechanism 712 and an electric control cabinet 713 are arranged on the outer wall of the electric retention frame 711, the cable lifting mechanism 712 comprises a cable reel 712.1 and a cable reversing wheel 712.2 which are arranged up and down, and the cable reel 712.1 is arranged on the outer wall of the electric retention frame 711 through a reel bracket 712.3;

the cable reel 712.1 adopts a motor-driven reel, and when the cable reel in the form is used for reeling a cable, the motor output torque is used as a reeling driving force to drive the reel to take up the cable; when the cable is released, the output torque of the motor becomes resistance to prevent the cable from quickly pulling the reel open, and the synchronism of the cable and the dredging device 7 is ensured.

The working principle of the external-in and internal-out type drum net bottom online dredging system is as follows:

when sludge in the sludge pit reaches a preset value, a sludge pit detection switch arranged at the top of the sludge pit sends a signal to start the dredging work;

the automatic walking device utilizes a special lifting appliance to lift the dredging device to be right above an opening of the dredging channel, the electric retention frame is left on the ground platform, the holding frame is lowered along the dredging channel, when the electric retention frame is lowered to a siltation pit opening, a contact switch at the top of the siltation pit sends a signal, the holding frame stops lowering, and the suction head continues to descend to the bottom of the siltation pit;

starting suction dredging operation, enabling a mixture of sludge and seawater to reach a graded filtering mechanism through a suction head, a suction pipeline, a suction center and a water flow speed reducing mechanism, and carrying out multi-stage filtration on sundries with different sizes and grades by the graded filtering mechanism;

the sludge in the grading filtering mechanism enters the garbage collector under the action of gravity, is discharged into the transport trolley below the mounting platform through the discharging mechanism, and is subjected to one-time dredging operation.

An external-in and internal-out type drum net bottom online dredging method is characterized in that the external-in and internal-out type drum net bottom online dredging system is adopted for dredging, and the specific dredging method is as follows:

firstly, designing a dredging channel special for sludge cleaning beside a network-blowing chamber when a civil foundation of equipment is designed in a nuclear power plant, and arranging a sedimentation pit in a flow passage on the back water side at the bottom of the network-blowing chamber, wherein the dredging channel is communicated with the sedimentation pit;

step two, when the sediment amount in the sediment pit reaches a preset value, the dredging operation is started;

step three, the dredging device is hoisted into the dredging channel by the automatic walking device and then is lowered to the mouth of the sedimentation pit, the suction head continues to go deep to the bottom of the sedimentation pit, and the dredging device starts the suction action to suck the sediment;

step four, in the suction process, the mixture of the sludge and the seawater is sucked into a dredging device, the sludge and the seawater are separated through the dredging device, the seawater is directly discharged, and the sludge is left in the dredging device to wait for sewage discharge;

and step five, when the single sediment bearing capacity of the dredging device is reached, the dredging device stops pumping, the automatic walking device lifts the dredging device to a ground sewage discharge position, the sediment is discharged into the transport trolley, and one-time dredging operation is completed.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (8)

1. The utility model provides an advance interior online desilting system of type drum net bottom outward, includes drum net room (1), be provided with cydariform filter screen (2) in drum net room (1), the front side intercommunication of drum net room (1) has into water runner (3), the rear side intercommunication of drum net room (1) has out water runner (4), its characterized in that: one side of drum net room (1) is along transversely setting up desilting passageway (5) of a plurality of interval arrangements, desilting passageway (5) vertical arrangement, the opening and the ground parallel and level of desilting passageway (5), the back of the body water side runner of drum net room (1) bottom is along transversely being provided with sedimentation pit (6) of a plurality of interval arrangements, a plurality of sedimentation pits (6) communicate with the bottom of a plurality of desilting passageways (5) respectively, but the top hoist and mount of a plurality of desilting passageways (5) have lateral shifting's desilting device (7), through in desilting device (7) transfer to sedimentation pit (6) through desilting passageway (5), carry out the suction clearance to the deposit.

2. The external-in and internal-out type drum network bottom online dredging system according to claim 1, characterized in that: the dredging device (7) comprises a holding frame (702), a dredging assembly is arranged in the holding frame (702), the dredging assembly comprises a suction mechanism (703), a water flow speed reducing mechanism (704), a grading filtering mechanism (705), a garbage collector (706) and a discharging mechanism (707) which are sequentially connected, the suction mechanism (703) and the grading filtering mechanism (705) are arranged on the left and right sides, the water flow speed reducing mechanism (704) is arranged between the suction mechanism (703) and the grading filtering mechanism (705), the garbage collector (706) and the discharging mechanism (707) are sequentially arranged below the grading filtering mechanism (705),

the suction mechanism (703) is used for sucking the sludge, and the suction mechanism (703) comprises a suction center (703.1), a suction pipeline (703.2) and a suction head assembly (703.3) which are sequentially connected from top to bottom;

the water flow speed reducing mechanism (704) is used for carrying out speed reduction treatment on the water flow flowing through the interior of the water flow speed reducing mechanism;

the graded filtering mechanism (705) is used for carrying out graded filtering on the sludge entrained in the water flow flowing through the graded filtering mechanism (705), the graded filtering mechanism (705) comprises a mesh cage (705.1), and a plurality of filter mesh chambers (705.3) are arranged in the mesh cage (705.1);

the garbage collector (706) is used for collecting the sludge accumulated in the graded filtering mechanism (705);

the discharge mechanism (707) is used for discharging the collected sludge.

3. The external-in and internal-out type drum network bottom online dredging system according to claim 1, characterized in that: the siltation pit (6) is of a quadrangular structure with the caliber gradually reduced from top to bottom.

4. The external-in and internal-out type drum net bottom online dredging system according to claim 3, characterized in that: the inclination angle of the inner wall of the sedimentation pit (6) is set to be 40-60 degrees.

5. The external-in and internal-out type drum network bottom online dredging system according to claim 1, characterized in that: and a sludge pit detection switch (8) is arranged at the top of the sludge pit (6).

6. The external-in and internal-out type drum network bottom online dredging system according to claim 1, characterized in that: and a contact switch (9) is arranged at the mouth of the sedimentation pit (6).

7. The external-in and internal-out type drum network bottom online dredging system according to claim 1, characterized in that: and a transport trolley (12) is arranged at the opening of the dredging channel (5).

8. The external-in and internal-out type drum network bottom online dredging system according to claim 1, characterized in that: and automatic traveling devices (13) for hoisting the dredging devices (7) are arranged above the plurality of dredging channels (5).

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